just in case you want to install the alarm yourself (like me) or just want to know where it is

Make:
Model:
Year:

Lexus
GS 300/GS 400
1998-2001


Remote Starter Wiring Colors and Notes

Function
DTI Color
Vehicle Color
Location
Notes:

Start:
Yellow
BLACK
IGNITION SWITCH HARNESS *
* This vehicle is equipped with a transponder immobilizer system. See Note # 144 Bypassing Transponder Type Theft System.

Ignition #1:
Blue
BLACK/YELLOW
IGNITION SWITCH HARNESS

Ignition #2:
Green
BLACK/WHITE
IGNITION SWITCH HARNESS

Ignition #3:
Wht/Blk
N/A


Accessory:
White
BLUE/YELLOW
IGNITION SWITCH HARNESS

Brake Light:
Orange
GREEN/WHITE
BRAKE PEDAL OR 20 PIN CONN. IN DR. KICK

Tach Signal:
Green
BLACK/YELLOW
DR. MOD. 28 PIN CONN. PIN 16 UNDER HOOD

Parking Lights:
Yellow
GREEN (+)
AT BOTTOM RIGHT OF FUSE PANEL

Headlights:
Yellow
RED/BLACK (-)
FROM SWITCH, RUNS DOWN STEERING COLUMN

OEM Alarm Disarm:
Brn/Wht



Diesel Glow Plug:
Red/Black



Clutch Bypass Wire:
n/a
N/A


Alarm and Keyless Entry Wiring Colors and Notes

Function
DTI Color
Vehicle Color
Location
Notes:

Constant +12 Volts:
Red
WHITE/BLUE
IGNITION SWITCH HARNESS
** See Note # 201 - Negative Pulse Door Lock System. Lock and Unlock Wires Are Found At The Door Lock Module That Can Only Be Found Inside Of The Driver's Door. Unlock Requires A Double Pulse.

Starter Kill:
Vlt or Wht
BLACK
IGNITION SWITCH HARNESS *

Ignition +12 Volts:
Orange
BLACK/YELLOW
IGNITION SWITCH HARNESS

Dome Lights/Superv:
Brown

IN DR. KICK PIN # 13 OF 25 PIN CONN. AT BCM

OEM Horn:
Blue
GREEN/BLACK (-)
STEERING COLUMN OR DR. KICK IN BLUE PLUG

Power Lock:
Wht/Red
LT. GREEN/BLACK (-)
IN DRIVER'S DOOR AT LOCK MODULE

Power Unlock:
Yel/Red
LT. GREEN/RED AND GRAY
(-) USE BOTH WIRES AND DOUBLE PULSE **

Trunk Release:
Grn/Wht
PURPLE/YELLOW (-)
AT RELEASE SWITCH

Alarm Input Wire:
R/W or Gy/Bk

IN DR. KICK PIN # 13 OF 25 PIN CONN. AT BCM

 

nm

 

Hello, where is exactly the location of the “Dome Lights/Superv:
Brown” ?

 

Hello, where is exactly the location of the “Dome Lights/Superv:
Brown” ?

It looks like he has identified that wire being in the fuse box in the drivers kick panel fuse box, the one behind the emergency brake. The wire your after is going to be in the wire harness going in the bcm, which is the black box bolted under the dash. The Body Control Module, which is the computer that controls the majority of the functions unrelated to the engine control module, or ecu.
You will need to pull the lower dash panels off and maybe pull the carpet back to find and access the bcm harness and tap i to it. I would test the circuit before adding anything to it.
Are you hooking up an aftermarket alarm system?

 

First of all thank you for your reply! I was trying to install the Viper..after market alarm. I found most of the wirings. Constant power. ACC power, trunk release wire, door lock and unlock are behind the driver door panel, lights wire and the starter wire but I am not planning to use it. Since the factory antithief starter killed. Do you know if the “Dom lights/Superv” is a door trigger for all the doors?

 

I haven’t upgraded the alarm in my GS, so I can’t tell u for certain. I have installed several Viper alarms over the years. It should be a great source for a door being opened. And it’s before the switch to change when the dome light comes on. If u tap in at the bcm, then you’ll get a power signal anytime a door is opened. I believe the trunk will also activate it. So that should be an ideal spot. U can use a standard test light to confirm it’s the right wire and it’s behavior.
I remember the only issue I had with my last Viper Alarm was to stick with 1 system or the other, if u lock the door with the original keyless entry you don’t want to also activate the viper alarm separately. I got use to just using the viper system but anytime someone else drove my car they would end up locking it with the OEM alarm and then trying to unlock it with the viper or something like that and then the alarm would be going off and the car wouldn’t start, all kinds of fun! Just some happy memories I felt like sharing…